Part of the modular belt system, this black Lens Changer 35 V3.0 from Think Tank Photo is a water-resistant nylon pouch designed for holding professional zoom lenses such as the 24-70mm f/2.8 or 70-200mm f/4 with their lens hood. The lens case attaches to any optional Think Tank belt or backpack, so you can easily use it while shooting for switching lenses on the go.